package thread;

class Counter {
    private int count = 0;

    public int getCount() {
        return count;
    }

    public static void fun(){
        synchronized (Counter.class){
            //....
        }
    }
    public void add() {
        synchronized (this) {
            count++;
        }

    }
}

public class Demo20 {
    public static void main(String[] args) throws InterruptedException {
        Counter counter = new Counter();

//        Object locker = new Object();
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
//                counter.add();
                Counter.fun();
            }
        });

        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
//                counter.add();
                Counter.fun();

            }
        });

        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println("count = " + counter.getCount());
    }
}
